Professional Electronic Dartboard Set with LCD DisplayKey Features Charging and Battery Two Modes: This electronic darts are designed for both charging and battery use (batteries require 4 AA batteries, 1. 5V, and batteries are not included), you can choose which way according to your own needs. And the electronic darts will enter sleep (power saving) mode if no key press or dart throw action for 10 minutes, so it will not waste power. Durable Material: The shell of the dart is made of ABS, and the